Question

What is the radius and diameter of the following circle?

18 cm
Radius =
cm
Diameter =
cm

Answer 1

9cm

Explanation:

Given diameter (D) = 18

Radius = Diameter divide by 2

18\2

9

Answer 2

Diameter is 18cm, as you're given the measure from one side of the semi-circle to the other. Radius is half of that, and therefore is 9cm.